EP3170643B1 - Dispositif de formage pour emboutir des godets - Google Patents

Dispositif de formage pour emboutir des godets Download PDF

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Publication number
EP3170643B1
EP3170643B1 EP15195629.9A EP15195629A EP3170643B1 EP 3170643 B1 EP3170643 B1 EP 3170643B1 EP 15195629 A EP15195629 A EP 15195629A EP 3170643 B1 EP3170643 B1 EP 3170643B1
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EP
European Patent Office
Prior art keywords
opening
moulding
moulding device
wall surface
mold
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP15195629.9A
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German (de)
English (en)
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EP3170643A1 (fr
Inventor
Detlev Gertitschke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Uhlmann Pac Systeme GmbH and Co KG
Original Assignee
Uhlmann Pac Systeme GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Uhlmann Pac Systeme GmbH and Co KG filed Critical Uhlmann Pac Systeme GmbH and Co KG
Priority to EP15195629.9A priority Critical patent/EP3170643B1/fr
Publication of EP3170643A1 publication Critical patent/EP3170643A1/fr
Application granted granted Critical
Publication of EP3170643B1 publication Critical patent/EP3170643B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/04—Combined thermoforming and prestretching, e.g. biaxial stretching
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/004—Shaping under special conditions
    • B29C2791/007—Using fluid under pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/26—Component parts, details or accessories; Auxiliary operations
    • B29C51/261—Handling means, e.g. transfer means, feeding means
    • B29C51/262—Clamping means for the sheets, e.g. clamping frames
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7132—Bowls, Cups, Glasses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7162—Boxes, cartons, cases
    • B29L2031/7164—Blister packages

Definitions

  • the present invention relates to a molding apparatus for deep drawing of cups in a heated film web.
  • Shaping devices of this kind are used, for example, in the pharmaceutical industry in the production of blister foils.
  • a plurality of wells is formed in a heated film web, in which the pharmaceutical products, such as dragees or tablets to be introduced.
  • the pharmaceutical products such as dragees or tablets to be introduced.
  • forming devices are used for deep drawing.
  • thermoforming of films for example by means of compressed air and / or vacuum suction or by pure positive molding.
  • pre-stretch dies are used to ensure uniform wall thicknesses depending on the type of film, film thickness and diameter / depth ratio of the cups to be formed, and to support the molding process.
  • a plurality of pre-stretching dies are provided, which are each supplied via separate feed lines with molding air.
  • a pre-stretching of the foil takes place at first, by the adjustment of the pre-stretching punch of a first tool relative to the die cut-outs of a second tool.
  • the shaping air is supplied via the supply lines and blown through the pre-stretch die in the pre-stretched mold cavity to obtain the final formation of the wells. This leads to high flow losses.
  • EP 1 116 579 A1 proposes a molding apparatus with an upper and a lower tool, wherein the upper tool has a Vorstreckstkov and the lower tool has a mold recess. In the Vorstreckstempel an air duct is formed.
  • DE 20 2011 001 623 U1 discloses a molding apparatus with pressing means for fixing a plastic film to the lower tool. The pressing device has through openings which are penetrated by pre-stretching dies of the upper tool during the molding process.
  • DE 20 2011 001623 discloses a molding apparatus for thermoforming wells in a heated film web having a first mold comprising a stamp member having at least one protruding stamp projection, a second mold having at least one mold recess, wherein the first and second molds are arranged and formed such that in a forming position of the molding device, the at least one punch projection is received in the at least one mold cavity in the second mold, wherein the first mold further comprises a pressure plate, in which at least one through hole is formed, and the at least one stamp projection in the mold position of the molding device, the at least one Through-hole penetrates, wherein in the stamping element further comprises a cavity which is bounded on one side by a wall surface, and the passage channel is connected via an opening in the wall surface with the cavity. It is the object of the present invention to provide a molding apparatus for deep drawing of wells in a heated film web, in which the throughput is optimized with lower air consumption.
  • a molding device for deep-drawing of cups in a heated film web is proposed with a first mold having a stamp element with at least one projecting stamp projection and a pressure plate in which at least one through-hole is formed.
  • the molding apparatus furthermore has a second molding tool with at least one molding recess.
  • the first and the second molding tool are arranged and designed such that in a molding position of the molding device, the at least one stamp projection penetrates the at least one through hole and is received in the at least one mold recess in the second mold.
  • a cavity is formed, which is bounded on one side by a wall surface, and in the stamp projection, a passageway is formed, which is connected via an opening in the wall surface with the cavity.
  • a valve device for opening and closing the opening in the wall surface is provided in the cavity.
  • the cavity formed in the stamp member functions as a compressed air reservoir for storing compressed air. Since this compressed air storage is in the immediate vicinity of the pre-stretch die, the transport path of the compressed air to the pre-stretch die is minimal. Thus, since the dead volume is minimal, there are no large amounts of compressed air waste, i. The refilling of the cavity with compressed air can be done very quickly, so that a higher clocking and thus an improved throughput can be achieved.
  • the wall surface is at least partially formed as a flat surface, so that the compressed air can distribute evenly in the vicinity of the opening.
  • a uniform distribution of compressed air near the opening is decisive for virtually loss-free flow behavior when the valve device is open.
  • the stamp element further comprises a connection for connecting an external compressed air source to the cavity is formed.
  • a connection for connecting an external compressed air source to the cavity is formed.
  • This is to supply the compressed air conventional, commercial compressed air lines, such as flexible lines used.
  • the maintenance and in particular the maintenance-related replacement of compressed air lines are simplified.
  • valve device comprises a valve main body which is arranged displaceably in the cavity, preferably vertically displaceable, and a closing element which is biased in the direction of the opening.
  • valve main body is a preferably horizontal valve plate.
  • the wall surface and the valve main body form a gap therebetween. The air flow behavior is stabilized since, when the valve device is opened, the compressed air flows in a defined lateral direction towards the opening and accordingly no turbulence occurs.
  • a particularly effective closing behavior of the closing element is achieved if in the valve plate, a central passage opening is formed and the closing element is mounted displaceably movable in the passage opening.
  • the closing element is resiliently supported on a further wall surface, which is opposite to the wall surface with the opening, in the direction of the second molding tool, whereby a constant closing force, which is applied to the closing element, is achieved.
  • the closing element itself is preferably spherical.
  • the stamping element further comprises a plate defining the cavity on the opposite side of the wall surface with the opening and in which at least one feedthrough opening is formed, wherein at least one push rod is provided which extends through the at least one feedthrough opening and is connected to the valve main body.
  • the linear actuator may preferably be a pneumatic cylinder or solenoid actuator.
  • Fig. 1 shows a sectional view of the structure of an embodiment of the molding apparatus 2 according to the invention.
  • the molding apparatus 2 is shown in the open state.
  • the forming device 2 for deep drawing of cups 4 in a heated film web 6 comprises a first mold 8 and a second mold 10. Between the first mold 8 and the second mold 10, the film web 6 is guided in the conveying direction F.
  • the first mold 8 is the upper mold and the second mold 10 is the lower mold, but it is also conceivable an upside down configuration as well as an oblique arrangement of these components relative to the horizontal.
  • the second mold 10 is spaced from the film web 6.
  • the second mold 10 is by means of a drive, not shown adjustable in a closing direction to the first mold 8.
  • the second mold 10 consists of a mold plate 12, in whose surface 14 at least one mold recess 16 is formed, which has the outer shape of a deep-drawable cup.
  • the first molding tool 8 comprises a stamping element 18 and a holding-down device 20.
  • the stamping element 18 and the holding-down device 20 are designed such that a part of the stamping element 18 is received in the direction of the second molding tool 10 and oppositely movable in the blank holder 20.
  • the hold-down 20 in the form of a U-profile with a pressure plate 21 and inwardly facing free end portions 22, 24 is formed.
  • This in Fig. 1 lower end of the punch member 18 has laterally projecting projections 26, 28.
  • One end of the punch member 18 is received in the open receiving space of the U-shaped hold-down 20 such that the laterally projecting protrusions 26, 28 can abut the surfaces of the inwardly facing free end portions 22, 24.
  • the hold-down 20 preferably always remains in its position, only the punch element 18 of the first mold 8 and the second mold 10 are moved.
  • the stamp member 18 on a punch projection 30 which in Fig.1 protrudes vertically downwards.
  • the punch projection 30 is screwed to a plate 34 of the punch member 18.
  • the pressure plate 21 of the blank holder 20 has a passage opening 32.
  • the punch projection 30 protrudes in the in Fig. 1 shown position in the through hole 32 into it.
  • the punch member 18 Upon movement of the punch member 18 in the direction of the second die 10, the punch member 18 abuts the pressure plate 21 and is disposed in a mold position in which the punch projection 30 penetrates the through hole 32, as in FIG Fig. 3 shown.
  • the punch member 18 consists of the plate 34, side walls 36, 38 and a plate 34 opposite the plate 40, which are interconnected so that they define a cavity 42 in the interior of the stamp member 18.
  • the side walls 36, 38 form a continuous, circumferential wall.
  • the Cavity 42 is defined by a wall surface 44, In Fig. 1 the upper surface of the plate 34, limited.
  • a passage 46 is formed, which is connected via an opening 48 in the wall surface 44 with the cavity 42 and communicates through outlet openings 50, 52 in the surface of the male projection 30 with the atmosphere.
  • valve device 55 for opening and closing the opening 48 in the wall surface 44 is provided.
  • the valve device 55 comprises a valve main body 56, in which a central passage opening 58 is formed, which in the arrangement according to FIG Fig. 1 runs vertically.
  • the valve main body 56 is flowed around by the air in the cavity 42 and is preferably formed as a valve plate.
  • a spherical closing element 60 is displaceably mounted together with a sliding element 62 and resiliently supported by a coil spring 64 on a wall surface 66, which is arranged opposite the wall surface 44.
  • the sliding member 62 is biased toward the opening 48 and presses against the spherical closure member 60, which is thus biased also in the direction of the opening 48 in the wall surface 44.
  • the passage opening 58 at the opening 48 facing side of the valve main body 56 has a smaller diameter than the closing element 60, whereby this is held captive in the direction of the opening 48 in the through hole 58.
  • the closure member 60 and the in Fig. 1 Lower opening of the passage opening 58 are also dimensioned so that in the in Fig. 1 shown biased position, a portion of the spherical closure member 60 from the valve main body 56 protrudes toward the opening 48.
  • the cavity 42 in Fig. 1 limited to the top, two passage openings 68, 70 are formed.
  • Two push rods 72, 74 extend from outside the cavity 42 through the passage openings 68, 70 into the cavity 42 and are connected to the valve main body 56. Both located outside of the cavity 42 ends of the push rods 72, 74 are connected via a crosspiece 76 with each other.
  • a linear actuator 78 is arranged, which can move the crosspiece 76 and thus the two push rods 72, 74 back and forth.
  • sealing means which seal the push rods 72, 74 relative to the passage openings 68, 70 airtight.
  • the cavity 42 is connected to an external source of compressed air to pressurize the cavity 42 with compressed air.
  • the connection 43 can be provided on the side walls 36, 38 or on the top plate 40.
  • the cavity 42 is constantly pressurized with compressed air.
  • a process for deep drawing a cup in a heated film web is described below with reference to Fig. 1 to 4 described.
  • Decisive for the function of the molding device 2 is the relative mobility of the various components of the molding device 2 to each other.
  • the second mold 10 is movable relative to the first mold 8
  • the stamp member 18 is movable relative to the hold-down 20
  • the valve main body 56 is movable relative to the cavity 42 delimiting wall surface 44 of the stamp member.
  • Fig. 1 the molding device 2 is shown in the open state, ie the second mold 10 is spaced from the first mold 8.
  • the hold-down 20 of the first mold 8 is just above the film web 6.
  • the stamp member 18 is arranged relative to the hold-down 20 so that the punch projection 30 extends in the entire passage opening 32 and also just above the film web 6.
  • the closing element 60 is moved to close the opening 48 in the closed position.
  • the valve main body 56 has been moved by the linear actuator 78 in the direction of the opening 48.
  • the cavity 42 is in the in Fig. 1 shown pressurized with compressed air.
  • Fig. 2 was the molding device 2, starting from the state in Fig. 1 arranged in a closed state by the second mold 10 has been moved in the direction of the first mold 8. In this case, the continuous film web 6 was fixed or clamped between the hold-down 20 of the first mold 8 and the second mold 10.
  • Fig. 3 are, starting from the state in Fig. 2 , the first die 8 and the second die 10 have been arranged to perform a pre-stretching operation in a forming position.
  • the punch element 18 relative to the hold-down 20 against the spring force of the coil springs 80, 82 in Direction of the second mold 10 moves.
  • the stamp projection 30 was arranged under pre-stretching or forming a portion of the film web 6 to provide a preliminary cup shape in the mold cavity 16 of the second mold 10.
  • the film web 6 lies exactly on the outer surface of the approximately hemispherical tip of the punch projection 30.
  • a pneumatic driver or a servomotor (not shown) may be used for moving the stamp member 18.
  • the closing element 60 is still arranged in the closed position for closing the opening 48.
  • FIG. 4 the state after completion of the compressed air molding process shown.
  • the valve main body 56 is linearly moved away from the opening 48 by the linear actuator 78, with the closing element 60 being engaged, so that the opening 48 in the wall surface 44 is released and a connection is made between the compressed air cavity 42 and the passage opening 32.
  • the opening 48 By releasing the opening 48, the compressed air is blown out of the cavity 42 through the through-hole 32 and the outlet openings 50, 52 in the punch projection 18 to the outside, so that the wall of the cup to form the final cup shape to the surface of the mold cavity 16 in the second Mold 10 is pressed.
  • the movement steps are reversed in the opposite direction, ie starting from Fig. 4 above Fig. 3 and Fig. 2 until finally the condition returns Fig. 1 is reached.
  • the cavity 42 can be refilled to the desired pressure.
  • the removal of the ejected during the molding process in the cup compressed air takes place between the states of Fig. 3 and Fig. 2 via the gap 90 between the plate 34 of the punch member 18 and the hold-down 20.
  • the gap 90 can either be open to the sides, as shown, or be designed as a closed space, which can be specifically vented via a venting device.
  • the linear actuator 78 for moving the valve main body 56 is the example in the Fig. 1 to 4 preferably designed as a pneumatic cylinder or as a servomotor.
  • Fig. 5 an embodiment is shown in which the linear actuator 78 is a linear magnetic actuator.
  • the magnetic actuator is integrated into the tool.
  • the magnetic actuator comprises magnets 100, 101, which are integrated in the plate 40.
  • the armatures 102, 103 replace the push rods 72, 74 and are fixed to the valve main body 56.
  • the passage openings 68, 70 omitted. This prevents possible sealing problems on the push rods 72, 74, and there are no moving cables.
  • the seal of the armature 102, 103 to the outside via a cross member, not shown, of the base station.
  • the punch member 18 will normally have a plurality of punch protrusions 30.
  • a corresponding plurality of passage openings 32 in the pressure plate 21 and a corresponding plurality of mold recesses 16 in the second mold 10 are provided.
  • the valve main body 56 then includes a corresponding number of through-holes 58 and displaceably mounted therein locking members 60th
  • connection 43 for connecting an external compressed air source may comprise a one-way valve, which allows an air flow from the outside into the cavity 42 and prevents air flow from the cavity 42 to the outside.
  • a rigid seat valve with a rubber lip on the valve main body 56 can also be used as closing element 60.
  • this solution requires tight tolerances.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Claims (13)

  1. Dispositif de formage (2) destiné à emboutir des godets (4) dans une bande de film (6) chauffée comprenant
    un premier outil de formage (8), qui comporte un élément poinçon (18) pourvu d'au moins une partie saillante de poinçon (30) en saillie, dans laquelle est formé un canal de passage (46),
    un deuxième outil de formage (10) pourvu d'au moins un évidement de formage (16),
    le premier et le deuxième outil de formage (8, 10) étant agencés et conçus de telle manière que, dans une position de formage du dispositif de formage (2), la ou les parties saillantes de poinçon (30) sont reçues dans l'évidement ou les évidements de formage (16) dans le deuxième outil de formage (10),
    le premier outil de formage (8) comprenant en outre une plaque de pression (21) dans laquelle est formée au moins une ouverture de passage (32), et la ou les parties saillantes de poinçon (30), dans la position de formage du dispositif de formage (2), traversant l'ouverture ou les ouvertures de passage (32),
    une cavité (42), qui est délimitée sur une face par une surface de paroi (44), étant ménagée en outre dans l'élément poinçon (18), et le canal de passage (46) étant relié à la cavité (42) par une ouverture (48) dans la surface de paroi (44), et
    un ensemble soupape (55) destiné à ouvrir et à fermer l'ouverture (48) dans la surface de paroi (44) étant prévu dans la cavité (42).
  2. Dispositif de formage (2) selon la revendication 1, caractérisé en ce que la surface de paroi (44) est réalisée sous la forme d'une surface plane.
  3. Dispositif de formage (2) selon la revendication 1 ou 2, caractérisé en ce qu'un raccord (43) destiné à raccorder une source d'air comprimé externe à la cavité (42) est réalisé en outre dans l'élément poinçon (18).
  4. Dispositif de formage (2) selon l'une quelconque des revendications précédentes, caractérisé en ce que l'ouverture (48) est entièrement entourée par la surface de paroi (44).
  5. Dispositif de formage (2) selon l'une quelconque des revendications précédentes, caractérisé en ce que l'ensemble soupape (55) comporte un corps principal de soupape (56), qui est monté mobile dans la cavité (42), et un élément de fermeture (60) précontraint en direction de l'ouverture (48).
  6. Dispositif de formage (2) selon la revendication 5, caractérisé en ce que le corps principal de soupape (56) est une plaque porte-soupape.
  7. Dispositif de formage (2) selon la revendication 6, caractérisé en ce qu'une ouverture de passage (58) centrale est ménagée dans la plaque porte-soupape et l'élément de fermeture (60) est monté de manière à pouvoir se déplacer dans l'ouverture de passage (58).
  8. Dispositif de formage (2) selon l'une quelconque des revendications 5 à 7, caractérisé en ce que l'élément de fermeture (60) est en appui élastique sur une autre surface de paroi (66), qui est opposée à la surface de paroi (44), en direction du deuxième outil de moulage (10).
  9. Dispositif de formage (2) selon l'une quelconque des revendications 5 à 8, caractérisé en ce que l'élément de fermeture (60) est sphérique.
  10. Dispositif de formage (2) selon l'une quelconque des revendications 5 à 9, caractérisé en ce que l'élément piston (18) comporte en outre une plaque (40), qui délimite la cavité (42) sur la face opposée à la surface de paroi (44) et dans laquelle est formée au moins une ouverture de passage (68, 70), et en ce qu'au moins une bielle (72, 74) est prévue, qui s'étend à travers l'ouverture ou les ouvertures de passage (68, 70) et qui est reliée au corps principal de soupape (56) .
  11. Dispositif de formage (2) selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un actionneur linéaire (78) est prévu, qui déplace l'ensemble soupape (55) en direction de l'ouverture (48) et à distance de l'ouverture (48).
  12. Dispositif de formage (2) selon la revendication 11, caractérisé en ce que l'actionneur linéaire (78) est un cylindre pneumatique.
  13. Dispositif de formage (2) selon l'une quelconque des revendications 1 à 9, caractérisé en ce qu'un actionneur linéaire (78) est prévu, qui déplace l'ensemble soupape (55) en direction de l'ouverture (48) et à distance de l'ouverture (48), l'actionneur linéaire (78) étant un actionneur magnétique.
EP15195629.9A 2015-11-20 2015-11-20 Dispositif de formage pour emboutir des godets Active EP3170643B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15195629.9A EP3170643B1 (fr) 2015-11-20 2015-11-20 Dispositif de formage pour emboutir des godets

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15195629.9A EP3170643B1 (fr) 2015-11-20 2015-11-20 Dispositif de formage pour emboutir des godets

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Publication Number Publication Date
EP3170643A1 EP3170643A1 (fr) 2017-05-24
EP3170643B1 true EP3170643B1 (fr) 2018-01-10

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Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010041236A1 (en) * 2000-01-12 2001-11-15 Nobuhiro Usui Foamed polyolefin-based resin container and process for producing the same
DE10220701A1 (de) 2002-05-10 2003-11-27 Illig Maschinenbau Adolf Formwerkzeug zum Tiefziehen von Behältern aus thermoplastischem Kunststoff
DE202011001623U1 (de) * 2011-01-17 2012-04-18 Gizeh Verpackungen Gmbh & Co. Kg Druckgas-Thermoform-Vorrichtung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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